netdev - [PATCH v2] net: hinic: Fix error handling in hinic_module

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Message-ID: <20221110021642.80378-1-yuancan@huawei.com>
Date:   Thu, 10 Nov 2022 02:16:42 +0000
From:   Yuan Can <yuancan@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <mqaio@...ux.alibaba.com>,
        <shaozhengchao@...wei.com>, <christophe.jaillet@...adoo.fr>,
        <gustavoars@...nel.org>, <luobin9@...wei.com>,
        <netdev@...r.kernel.org>
CC:     <yuancan@...wei.com>
Subject: [PATCH v2] net: hinic: Fix error handling in hinic_module_init()

A problem about hinic create debugfs failed is triggered with the
following log given:

 [  931.419023] debugfs: Directory 'hinic' with parent '/' already present!

The reason is that hinic_module_init() returns pci_register_driver()
directly without checking its return value, if pci_register_driver()
failed, it returns without destroy the newly created debugfs, resulting
the debugfs of hinic can never be created later.

 hinic_module_init()
   hinic_dbg_register_debugfs() # create debugfs directory
   pci_register_driver()
     driver_register()
       bus_add_driver()
         priv = kzalloc(...) # OOM happened
   # return without destroy debugfs directory

Fix by removing debugfs when pci_register_driver() returns error.

Fixes: 253ac3a97921 ("hinic: add support to query sq info")
Signed-off-by: Yuan Can <yuancan@...wei.com>
---
Changes in v2:
- Change to simpler error handling style

 drivers/net/ethernet/huawei/hinic/hinic_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
index e1f54a2f28b2..2d6906aba2a2 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
@@ -1474,8 +1474,15 @@ static struct pci_driver hinic_driver = {
 
 static int __init hinic_module_init(void)
 {
+	int ret;
+
 	hinic_dbg_register_debugfs(HINIC_DRV_NAME);
-	return pci_register_driver(&hinic_driver);
+
+	ret = pci_register_driver(&hinic_driver);
+	if (ret)
+		hinic_dbg_unregister_debugfs();
+
+	return ret;
 }
 
 static void __exit hinic_module_exit(void)
-- 
2.17.1